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HarborLAB launch (beige building to the right) on the Newtown Creek from the Pulaski Bridge. The East River and its branches, like the creek, are saltier and so don’t freeze as easily, but perhaps the creek’s water treatment plant’s outflows and street runoffs are freezing? Photo by Steve Scofield of the Transportation Alternatives Queens Activist Committee (http://transalt.org/getinvolved/neighborhood/queens).

1867 etching of a flow of humanity across the frozen East River. One of eight times the strait froze over during that century. Image via Gothamist (click for link).

Ice floes on the East River are a rare sight in recent years, but the Brooklyn Bridge is a daily reminder of how extreme even relatively recent planetary climate fluctuations have been. Let’s explore how that is so, and take a fun detour into the molecular structure of water.

When scientists worry about climate change and global warming, they’re not ignoring the fact that Earth has experienced wildly different atmospheric compositions and temperatures over its 3.8 billion years as a living world. What we’re destabilizing, they worry, are the conditions that for 12,000 years have fostered the neolithic agricultural revolution and civilization itself.

That said, there are records, written and archeological, of worldwide changes that lasted years or even centuries. Might we enter another “Little Ice Age” like that of roughly 1300-1870? To get an idea of how severe winters of that period could be, several times the East River froze over. Brave souls walked over “ice bridges” from Brooklyn to Manhattan, but ferries vital to commerce were locked in place. After this happened again in the winter of 1866-67, businesses in our growing metropolis had enough and lobbied hard for a long-contemplated “Great East River Bridge” to keep commerce flowing in all weather. As it happens, the Brooklyn Bridge was completed in 1883, eight years after the East River last froze over solid. In a sense, the Brooklyn Bridge touches down on the shores of two boroughs and on the shores of two climatic ages. And we might have a Brooklyn Bridge because the Sun lacked spots!

A few things can cause the planet to cool. Some ascribe the deepest points of the Little Ice Age to the Maunder Minimum, a period sunspots and solar flares were extremely rare. Our sun is in a lull right now, but a 2012 NASA study found that recent solar inactivity hasn’t impacted our planet’s “energy budget” much. A 2013 study by researchers with the National Center for Atmospheric Research (part of the National Science Foundation) and partners concluded that a Maunder Minimum redux wouldn’t save us from global warming.

Just as adding carbon dioxide, water vapor, and methane to the atmosphere can warm the planet, kicking up dust and soot can cool it. Volcanoes have caused global cooling, as perhaps have asteroids and comets (even beloved Halley’s Comet). Some people even advocate for “geoengineering” projects that would cool the planet, but implementation could bring their own disasters. Besides, Ocean acidification, which could collapse the planetary ecosystem, would proceed apace if we continue to burn fossil fuels, even if we dust up to cool down.

East River ice floes and Hunter’s Point South (and the ice-whitened mouth of the Newtown Creek). Photo by Mark Christie of Friends of Gantry and Neighborhood Parks (http://friendsofgantry.org/).

East River ice floes floating past Gantry Plaza State Park in Long Island City, Queens. Photo by Mark Christie of Friends of Gantry and Neighborhood Parks (http://friendsofgantry.org/).